Hi,

I got the schematics now and I see that J9B4 is connected to Embedded Controller (EC), so I think that this is not 8250 UART2. Am I right?

I am not able to find the documentation what purpose is served by Embedded Controller and does coreboot use it at all? Any pointers please. I am trying to understand what is the purpose of COM port at J9B4. Any specific document that I should refer to to understand it? I checked user guide and schematics.

There are 2 com ports I see using usb to serial and Port0 is used for console. Is another port on usb to serial is spare and can be used for console or is it serving some other purpose in coreboot.

On Fri, Nov 7, 2014 at 3:51 PM, Gailu Singh <gailu96@gmail.com> wrote:

Hi Experts,

I have working console uart 0 on Baytrail CRB board. However I am trying to change to uart 2 (J9B4) DB9 connector. I have changed CONFIG_UART_FOR_CONSOLE=2 from menuconfig, cleaned and rebuild and flashed coreboot but do not see any log on port 2. Is there any other changes required apart from CONFIG_UART_FOR_CONSOLE ?